With Cage, Feldman and Brown was one of the 4 apostles of the New York School of composers and the main initiator of open form in the 1950s. Often using graphic scores or rules, his pieces offer enormous freedom to the interpreter - they are pretexts for music rather than instructions. Against Cage, he welcomed improvisation into the world of contemporary music. His pieces are nterpreted here by various hands, including one by Brown himself. Others include Christian Wolff (the only one of the four still alive), Stephen Drury, Joan La Barbara, Wadada Leo Smith, Ikue Mori, Sylvie Courvoisier, Larry Polansky, Mark Feldman and Morton Subotnik.